package de.fub.bytecode.util;


import de.fub.bytecode.classfile.*;
import java.io.*;

/**
 * Convert constant pool into HTML file.
 *
 * @version $Id: ConstantHTML.java,v 1.1.1.1 2000/08/10 16:05:07 cvs Exp $
 * @author  <A HREF="http://www.inf.fu-berlin.de/~dahm">M. Dahm</A>
 * 
 */
final class ConstantHTML implements de.fub.bytecode.Constants {
  private String 	class_name;     // name of current class
  private String 	class_package;  // name of package
  private ConstantPool 	constant_pool;  // reference to constant pool
  private PrintWriter	file;		// file to write to
  private String[]  	constant_ref;	// String to return for cp[i]
  private Constant[]	constants;	// The constants in the cp
  private Method[]      methods;

  ConstantHTML(String dir, String class_name, String class_package, Method[] methods,
	       ConstantPool constant_pool) throws IOException
  {
	this.class_name   	= class_name;
	this.class_package	= class_package;
	this.constant_pool	= constant_pool;
	this.methods        = methods;
	constants		= constant_pool.getConstantPool();
	file 		= new PrintWriter(new FileOutputStream(dir + class_name + "_cp.html"));
	constant_ref	= new String[constants.length];
	constant_ref[0]     = "&lt;unknown&gt;";
	
	file.println("<HTML><BODY BGCOLOR=\"#C0C0C0\"><TABLE BORDER=0>");
	
	// Loop through constants, constants[0] is reserved
	for(int i=1; i < constants.length; i++) {
	  if(i % 2 == 0)
	file.print("<TR BGCOLOR=\"#C0C0C0\"><TD>");
	  else
	file.print("<TR BGCOLOR=\"#A0A0A0\"><TD>");

	  if(constants[i] != null)
	writeConstant(i);
	  
	  file.print("</TD></TR>\n");
	}
		
	file.println("</TABLE></BODY></HTML>");
	file.close();
  }  
  private final int getMethodNumber(String str) {
	for(int i=0; i < methods.length; i++) {
	  String cmp = methods[i].getName() + methods[i].getSignature();
	  if(cmp.equals(str))
	return i;
	}
	return -1;
  }  
  String referenceConstant(int index) {
	return constant_ref[index];
  }  
  private void writeConstant(int index) {
	byte   tag = constants[index].getTag();
	int    class_index, name_index;
	String ref;	
	
	// The header is always the same
	file.println("<H4> <A NAME=cp" + index + ">" + index + "</A> " + CONSTANT_NAMES[tag] + "</H4>");

	/* For every constant type get the needed parameters and print them appropiately 
	 */
	switch(tag) {
	case CONSTANT_InterfaceMethodref:
	case CONSTANT_Methodref:
	  // Get class_index and name_and_type_index, depending on type
	  if(tag == CONSTANT_Methodref) {
	ConstantMethodref c = (ConstantMethodref)constant_pool.getConstant(index, CONSTANT_Methodref);
	class_index = c.getClassIndex();
	name_index  = c.getNameAndTypeIndex();
	  }
	  else {
	ConstantInterfaceMethodref c1 = (ConstantInterfaceMethodref)constant_pool.getConstant(index, CONSTANT_InterfaceMethodref);
	class_index = c1.getClassIndex();
	name_index  = c1.getNameAndTypeIndex();
	  }

	  // Get method name and its class
	  String method_name	= constant_pool.constantToString(name_index, CONSTANT_NameAndType);
	  String html_method_name = Class2HTML.toHTML(method_name);
	  
	  // Partially compacted class name, i.e. / -> .
	  String method_class = constant_pool.constantToString(class_index, CONSTANT_Class);
	  String short_method_class 	= Utility.compactClassName(method_class); // I.e., remove java.lang.
	  short_method_class = Utility.compactClassName(method_class); // I.e., remove java.lang.
	  short_method_class = Utility.compactClassName(short_method_class, class_package + ".", true); // Remove class package prefix

	  // Get method signature
	  ConstantNameAndType c2 = (ConstantNameAndType)constant_pool.getConstant(name_index, CONSTANT_NameAndType);
	  String signature = constant_pool.constantToString(c2.getSignatureIndex(), CONSTANT_Utf8);
	  // Get array of strings containing the argument types
	  String[] args = Utility.methodSignatureArgumentTypes(signature, false);
			
	  // Get return type string
	  String type = Utility.methodSignatureReturnType(signature, false);
	  String ret_type = Class2HTML.referenceType(type);

	  StringBuffer buf = new StringBuffer("(");
	  for(int i=0; i < args.length; i++) {
	buf.append(Class2HTML.referenceType(args[i]));
	if(i < args.length - 1)
	  buf.append(",&nbsp;");
	  }			
	  buf.append(")");

	  String arg_types = buf.toString();
			
	  if(method_class.equals(class_name)) // Method is local to class
	ref = "<A HREF=\"" + class_name + "_code.html#method" + getMethodNumber(method_name + signature) +
	  "\" TARGET=Code>" + html_method_name + "</A>";
	  else
	ref = "<A HREF=\"" + method_class + ".html" + "\" TARGET=_top>" + short_method_class +
	  "</A>." + html_method_name;

	  constant_ref[index] = ret_type + "&nbsp;<A HREF=\"" + class_name + "_cp.html#cp" + class_index +
	"\" TARGET=Constants>" +
	short_method_class + "</A>.<A HREF=\"" + class_name + "_cp.html#cp" +
	index +	"\" TARGET=ConstantPool>" + html_method_name + "</A>&nbsp;" + arg_types;

	  file.println("<P><TT>" + ret_type + "&nbsp;" + ref + arg_types + "&nbsp;</TT>\n<UL>" +
		   "<LI><A HREF=\"#cp" + class_index + "\">Class index(" + class_index +	")</A>\n" +
		   "<LI><A HREF=\"#cp" + name_index + "\">NameAndType index(" + name_index + ")</A></UL>");
	  break;

	case CONSTANT_Fieldref:
	  // Get class_index and name_and_type_index
	  ConstantFieldref c3 = (ConstantFieldref)constant_pool.getConstant(index, CONSTANT_Fieldref);
	  class_index = c3.getClassIndex();
	  name_index  = c3.getNameAndTypeIndex();

	  // Get method name and its class (compacted)
	  String field_class = constant_pool.constantToString(class_index, CONSTANT_Class);
	  String short_field_class = Utility.compactClassName(field_class); // I.e., remove java.lang.
	  short_field_class = Utility.compactClassName(short_field_class, class_package + ".", true); // Remove class package prefix

	  String field_name  = constant_pool.constantToString(name_index, CONSTANT_NameAndType);

	  if(field_class.equals(class_name)) // Field is local to class
	ref = "<A HREF=\"" + field_class + "_methods.html#field" + 
	  field_name + "\" TARGET=Methods>" + field_name + "</A>";
	  else
	ref = "<A HREF=\"" + field_class + ".html\" TARGET=_top>" +
	  short_field_class + "</A>." + field_name + "\n";

	  constant_ref[index] = "<A HREF=\"" + class_name + "_cp.html#cp" + class_index +	"\" TARGET=Constants>" +
	short_field_class + "</A>.<A HREF=\"" + class_name + "_cp.html#cp" +
	index +	"\" TARGET=ConstantPool>" + field_name + "</A>";
 												
	  file.println("<P><TT>" + ref + "</TT><BR>\n" + "<UL>" +
		   "<LI><A HREF=\"#cp" + class_index + "\">Class(" + class_index +	")</A><BR>\n" +
		   "<LI><A HREF=\"#cp" + name_index + "\">NameAndType(" + name_index + ")</A></UL>");
	  break;
	  		
	case CONSTANT_Class:
	  ConstantClass c4 = (ConstantClass)constant_pool.getConstant(index, CONSTANT_Class);
	  name_index  = c4.getNameIndex();
	  String class_name2  = constant_pool.constantToString(index, tag); // / -> .
	  String short_class_name = Utility.compactClassName(class_name2); // I.e., remove java.lang.
	  short_class_name = Utility.compactClassName(short_class_name, class_package + ".", true); // Remove class package prefix

	  ref = "<A HREF=\"" + class_name2 + ".html\" TARGET=_top>" + short_class_name + "</A>";
	  constant_ref[index] = "<A HREF=\"" + class_name + "_cp.html#cp" + index +
	"\" TARGET=ConstantPool>" + short_class_name + "</A>";
											
	  file.println("<P><TT>" + ref + "</TT><UL>" +
		   "<LI><A HREF=\"#cp" + name_index + "\">Name index(" + name_index + 	")</A></UL>\n");
	  break;
	
	case CONSTANT_String:
	  ConstantString c5 = (ConstantString)constant_pool.getConstant(index, CONSTANT_String);
	  name_index = c5.getStringIndex();

	  String str = Class2HTML.toHTML(constant_pool.constantToString(index, tag));
  
	  file.println("<P><TT>" + str + "</TT><UL>" + 
		   "<LI><A HREF=\"#cp" + name_index + "\">Name index(" + name_index +	")</A></UL>\n");
	  break;
	
	case CONSTANT_NameAndType:
	  ConstantNameAndType c6 = (ConstantNameAndType)constant_pool.getConstant(index, CONSTANT_NameAndType);
	  name_index = c6.getNameIndex();
	  int signature_index = c6.getSignatureIndex();

	  file.println("<P><TT>" + Class2HTML.toHTML(constant_pool.constantToString(index, tag)) + "</TT><UL>" +
		   "<LI><A HREF=\"#cp" + name_index + "\">Name index(" + name_index + ")</A>\n" +
		   "<LI><A HREF=\"#cp" + signature_index + "\">Signature index(" + 
		   signature_index + ")</A></UL>\n");
	  break;

	default:
	  file.println("<P><TT>" + Class2HTML.toHTML(constant_pool.constantToString(index, tag)) + "</TT>\n");
	} // switch
  }  
}